Exile the top three cards of your library. Until end of turn, you may play cards exiled this way. (If you cast a spell this way, you still pay its costs. You can play a land this way only if you have an available land play remaining.)

+1: Up to one target creature you control gets +1/+1 and gains lifelink, first strike, and vigilance until end of turn.
-2: Put a +1/+1 counter on each creature you control, the put a loyalty counter on each other planeswalker you control.
-7: You get en emblem with "If damage would be dealt to you or a planeswalker you control, prevent all but 1 of that damage."

Whenever a creature an opponent controls dies, Altac Bloodseeker gets +2/+0 and gains first strike and haste until end of turn. (It deals damage before creatures without first strike, and it can attack and tap as soon as it comes under your control.)